<!DOCTYPE HTML>
<html>
<body>
<div class="scrollTop" style="width:400px; height:400px; margin-top:10.5px; font-size:21px; white-space:pre; overflow:hidden;">Hello Kitty
  Hello Kitty
  Hello Kitty
  Hello Kitty
  Hello Kitty
  Hello Kitty
  Hello Kitty
  Hello Kitty
  Hello Kitty
  Hello Kitty
  Hello Kitty
  <div style="height:800px;"></div>
</div>
<script src="scrolling.js"></script>
</body>
</html>
